path: root/src/demos/gears/Gears.java

package demos.gears;

import java.awt.Dimension;
import java.awt.Frame;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.awt.AWTGLAutoDrawable;
import javax.media.opengl.awt.GLCanvas;
import javax.media.opengl.awt.gl2.GL2JPanel;
import javax.media.opengl.util.Animator;

/**
 * Gears.java <BR>
 * author: Brian Paul (converted to Java by Ron Cemer and Sven Goethel) <P>
 *
 * This version is equal to Brian Paul's version 1.2 1999/10/21
 */

public class Gears implements GLEventListener, MouseListener, MouseMotionListener {
  public static void main(String[] args) {
    Frame frame = new Frame("Gear Demo");
    GLCanvas canvas = new GLCanvas();

    final Gears gears = new Gears();
    canvas.addGLEventListener(gears);

    frame.add(canvas);
    frame.setSize(300, 300);
    final Animator animator = new Animator(canvas);
    frame.addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
          // Run this on another thread than the AWT event queue to
          // make sure the call to Animator.stop() completes before
          // exiting
          new Thread(new Runnable() {
              public void run() {
                animator.stop();
                System.exit(0);
              }
            }).start();
        }
      });
    frame.setVisible(true);
    animator.start();
  }

  private float view_rotx = 20.0f, view_roty = 30.0f, view_rotz = 0.0f;
  private int gear1, gear2, gear3;
  private float angle = 0.0f;

  private int prevMouseX, prevMouseY;
  private boolean mouseRButtonDown = false;

  public void init(GLAutoDrawable drawable) {
    // Use debug pipeline
    // drawable.setGL(new DebugGL(drawable.getGL()));

    GL2 gl = drawable.getGL().getGL2();

    System.err.println("INIT GL IS: " + gl.getClass().getName());

    System.err.println("Chosen GLCapabilities: " + drawable.getChosenGLCapabilities());

    gl.setSwapInterval(1);

    float pos[] = { 5.0f, 5.0f, 10.0f, 0.0f };
    float red[] = { 0.8f, 0.1f, 0.0f, 1.0f };
    float green[] = { 0.0f, 0.8f, 0.2f, 1.0f };
    float blue[] = { 0.2f, 0.2f, 1.0f, 1.0f };

    gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_POSITION, pos, 0);
    gl.glEnable(GL2.GL_CULL_FACE);
    gl.glEnable(GL2.GL_LIGHTING);
    gl.glEnable(GL2.GL_LIGHT0);
    gl.glEnable(GL2.GL_DEPTH_TEST);
            
    /* make the gears */
    gear1 = gl.glGenLists(1);
    gl.glNewList(gear1, GL2.GL_COMPILE);
    gl.glMaterialfv(GL2.GL_FRONT, GL2.GL_AMBIENT_AND_DIFFUSE, red, 0);
    gear(gl, 1.0f, 4.0f, 1.0f, 20, 0.7f);
    gl.glEndList();
            
    gear2 = gl.glGenLists(1);
    gl.glNewList(gear2, GL2.GL_COMPILE);
    gl.glMaterialfv(GL2.GL_FRONT, GL2.GL_AMBIENT_AND_DIFFUSE, green, 0);
    gear(gl, 0.5f, 2.0f, 2.0f, 10, 0.7f);
    gl.glEndList();
            
    gear3 = gl.glGenLists(1);
    gl.glNewList(gear3, GL2.GL_COMPILE);
    gl.glMaterialfv(GL2.GL_FRONT, GL2.GL_AMBIENT_AND_DIFFUSE, blue, 0);
    gear(gl, 1.3f, 2.0f, 0.5f, 10, 0.7f);
    gl.glEndList();
            
    gl.glEnable(GL2.GL_NORMALIZE);
                
    if (drawable instanceof AWTGLAutoDrawable) {
        AWTGLAutoDrawable awtDrawable = (AWTGLAutoDrawable) drawable;
        awtDrawable.addMouseListener(this);
        awtDrawable.addMouseMotionListener(this);
    }
  }
    
  public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
    GL2 gl = drawable.getGL().getGL2();

    float h = (float)height / (float)width;
            
    gl.glMatrixMode(GL2.GL_PROJECTION);

    System.err.println("GL_VENDOR: " + gl.glGetString(GL2.GL_VENDOR));
    System.err.println("GL_RENDERER: " + gl.glGetString(GL2.GL_RENDERER));
    System.err.println("GL_VERSION: " + gl.glGetString(GL2.GL_VERSION));
    gl.glLoadIdentity();
    gl.glFrustum(-1.0f, 1.0f, -h, h, 5.0f, 60.0f);
    gl.glMatrixMode(GL2.GL_MODELVIEW);
    gl.glLoadIdentity();
    gl.glTranslatef(0.0f, 0.0f, -40.0f);
  }

  public void display(GLAutoDrawable drawable) {
    // Turn the gears' teeth
    angle += 2.0f;

    // Get the GL corresponding to the drawable we are animating
    GL2 gl = drawable.getGL().getGL2();

    // Special handling for the case where the GLJPanel is translucent
    // and wants to be composited with other Java 2D content
    if ((drawable instanceof GL2JPanel) &&
        !((GL2JPanel) drawable).isOpaque() &&
        ((GL2JPanel) drawable).shouldPreserveColorBufferIfTranslucent()) {
      gl.glClear(GL2.GL_DEPTH_BUFFER_BIT);
    } else {
      gl.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);
    }
            
    // Rotate the entire assembly of gears based on how the user
    // dragged the mouse around
    gl.glPushMatrix();
    gl.glRotatef(view_rotx, 1.0f, 0.0f, 0.0f);
    gl.glRotatef(view_roty, 0.0f, 1.0f, 0.0f);
    gl.glRotatef(view_rotz, 0.0f, 0.0f, 1.0f);
            
    // Place the first gear and call its display list
    gl.glPushMatrix();
    gl.glTranslatef(-3.0f, -2.0f, 0.0f);
    gl.glRotatef(angle, 0.0f, 0.0f, 1.0f);
    gl.glCallList(gear1);
    gl.glPopMatrix();
            
    // Place the second gear and call its display list
    gl.glPushMatrix();
    gl.glTranslatef(3.1f, -2.0f, 0.0f);
    gl.glRotatef(-2.0f * angle - 9.0f, 0.0f, 0.0f, 1.0f);
    gl.glCallList(gear2);
    gl.glPopMatrix();
            
    // Place the third gear and call its display list
    gl.glPushMatrix();
    gl.glTranslatef(-3.1f, 4.2f, 0.0f);
    gl.glRotatef(-2.0f * angle - 25.0f, 0.0f, 0.0f, 1.0f);
    gl.glCallList(gear3);
    gl.glPopMatrix();
            
    // Remember that every push needs a pop; this one is paired with
    // rotating the entire gear assembly
    gl.glPopMatrix();
  }

  public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {}

  public static void gear(GL2 gl,
                          float inner_radius,
                          float outer_radius,
                          float width,
                          int teeth,
                          float tooth_depth)
  {
    int i;
    float r0, r1, r2;
    float angle, da;
    float u, v, len;

    r0 = inner_radius;
    r1 = outer_radius - tooth_depth / 2.0f;
    r2 = outer_radius + tooth_depth / 2.0f;
            
    da = 2.0f * (float) Math.PI / teeth / 4.0f;
            
    gl.glShadeModel(GL2.GL_FLAT);

    gl.glNormal3f(0.0f, 0.0f, 1.0f);

    /* draw front face */
    gl.glBegin(GL2.GL_QUAD_STRIP);
    for (i = 0; i <= teeth; i++)
      {
        angle = i * 2.0f * (float) Math.PI / teeth;
        gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), width * 0.5f);
        gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), width * 0.5f);
        if(i < teeth)
          {
            gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), width * 0.5f);
            gl.glVertex3f(r1 * (float)Math.cos(angle + 3.0f * da), r1 * (float)Math.sin(angle + 3.0f * da), width * 0.5f);
          }
      }
    gl.glEnd();

    /* draw front sides of teeth */
    gl.glBegin(GL2.GL_QUADS);
    for (i = 0; i < teeth; i++)
      {
        angle = i * 2.0f * (float) Math.PI / teeth;
        gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), width * 0.5f);
        gl.glVertex3f(r2 * (float)Math.cos(angle + da), r2 * (float)Math.sin(angle + da), width * 0.5f);
        gl.glVertex3f(r2 * (float)Math.cos(angle + 2.0f * da), r2 * (float)Math.sin(angle + 2.0f * da), width * 0.5f);
        gl.glVertex3f(r1 * (float)Math.cos(angle + 3.0f * da), r1 * (float)Math.sin(angle + 3.0f * da), width * 0.5f);
      }
    gl.glEnd();
    
    /* draw back face */
    gl.glBegin(GL2.GL_QUAD_STRIP);
    for (i = 0; i <= teeth; i++)
      {
        angle = i * 2.0f * (float) Math.PI / teeth;
        gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), -width * 0.5f);
        gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), -width * 0.5f);
        gl.glVertex3f(r1 * (float)Math.cos(angle + 3 * da), r1 * (float)Math.sin(angle + 3 * da), -width * 0.5f);
        gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), -width * 0.5f);
      }
    gl.glEnd();
    
    /* draw back sides of teeth */
    gl.glBegin(GL2.GL_QUADS);
    for (i = 0; i < teeth; i++)
      {
        angle = i * 2.0f * (float) Math.PI / teeth;
        gl.glVertex3f(r1 * (float)Math.cos(angle + 3 * da), r1 * (float)Math.sin(angle + 3 * da), -width * 0.5f);
        gl.glVertex3f(r2 * (float)Math.cos(angle + 2 * da), r2 * (float)Math.sin(angle + 2 * da), -width * 0.5f);
        gl.glVertex3f(r2 * (float)Math.cos(angle + da), r2 * (float)Math.sin(angle + da), -width * 0.5f);
        gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), -width * 0.5f);
      }
    gl.glEnd();
    
    /* draw outward faces of teeth */
    gl.glBegin(GL2.GL_QUAD_STRIP);
    for (i = 0; i < teeth; i++)
      {
        angle = i * 2.0f * (float) Math.PI / teeth;
        gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), width * 0.5f);
        gl.glVertex3f(r1 * (float)Math.cos(angle), r1 * (float)Math.sin(angle), -width * 0.5f);
        u = r2 * (float)Math.cos(angle + da) - r1 * (float)Math.cos(angle);
        v = r2 * (float)Math.sin(angle + da) - r1 * (float)Math.sin(angle);
        len = (float)Math.sqrt(u * u + v * v);
        u /= len;
        v /= len;
        gl.glNormal3f(v, -u, 0.0f);
        gl.glVertex3f(r2 * (float)Math.cos(angle + da), r2 * (float)Math.sin(angle + da), width * 0.5f);
        gl.glVertex3f(r2 * (float)Math.cos(angle + da), r2 * (float)Math.sin(angle + da), -width * 0.5f);
        gl.glNormal3f((float)Math.cos(angle), (float)Math.sin(angle), 0.0f);
        gl.glVertex3f(r2 * (float)Math.cos(angle + 2 * da), r2 * (float)Math.sin(angle + 2 * da), width * 0.5f);
        gl.glVertex3f(r2 * (float)Math.cos(angle + 2 * da), r2 * (float)Math.sin(angle + 2 * da), -width * 0.5f);
        u = r1 * (float)Math.cos(angle + 3 * da) - r2 * (float)Math.cos(angle + 2 * da);
        v = r1 * (float)Math.sin(angle + 3 * da) - r2 * (float)Math.sin(angle + 2 * da);
        gl.glNormal3f(v, -u, 0.0f);
        gl.glVertex3f(r1 * (float)Math.cos(angle + 3 * da), r1 * (float)Math.sin(angle + 3 * da), width * 0.5f);
        gl.glVertex3f(r1 * (float)Math.cos(angle + 3 * da), r1 * (float)Math.sin(angle + 3 * da), -width * 0.5f);
        gl.glNormal3f((float)Math.cos(angle), (float)Math.sin(angle), 0.0f);
      }
    gl.glVertex3f(r1 * (float)Math.cos(0), r1 * (float)Math.sin(0), width * 0.5f);
    gl.glVertex3f(r1 * (float)Math.cos(0), r1 * (float)Math.sin(0), -width * 0.5f);
    gl.glEnd();
    
    gl.glShadeModel(GL2.GL_SMOOTH);
    
    /* draw inside radius cylinder */
    gl.glBegin(GL2.GL_QUAD_STRIP);
    for (i = 0; i <= teeth; i++)
      {
        angle = i * 2.0f * (float) Math.PI / teeth;
        gl.glNormal3f(-(float)Math.cos(angle), -(float)Math.sin(angle), 0.0f);
        gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), -width * 0.5f);
        gl.glVertex3f(r0 * (float)Math.cos(angle), r0 * (float)Math.sin(angle), width * 0.5f);
      }
    gl.glEnd();
  }

  // Methods required for the implementation of MouseListener
  public void mouseEntered(MouseEvent e) {}
  public void mouseExited(MouseEvent e) {}

  public void mousePressed(MouseEvent e) {
    prevMouseX = e.getX();
    prevMouseY = e.getY();
    if ((e.getModifiers() & e.BUTTON3_MASK) != 0) {
      mouseRButtonDown = true;
    }
  }
    
  public void mouseReleased(MouseEvent e) {
    if ((e.getModifiers() & e.BUTTON3_MASK) != 0) {
      mouseRButtonDown = false;
    }
  }
    
  public void mouseClicked(MouseEvent e) {}
    
  // Methods required for the implementation of MouseMotionListener
  public void mouseDragged(MouseEvent e) {
    int x = e.getX();
    int y = e.getY();
    Dimension size = e.getComponent().getSize();

    float thetaY = 360.0f * ( (float)(x-prevMouseX)/(float)size.width);
    float thetaX = 360.0f * ( (float)(prevMouseY-y)/(float)size.height);
    
    prevMouseX = x;
    prevMouseY = y;

    view_rotx += thetaX;
    view_roty += thetaY;
  }
    
  public void mouseMoved(MouseEvent e) {}
}